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derivation from Uncaria gambir

…roots of Carapichea ipecacuanha; and gambier, a substance that is used in tanning, from Uncaria gambir. Some trees in the family provide useful timber. Common madder (Rubia tinctorum) was formerly cultivated for the red dye obtained from its roots (alizarin); the roots of crosswort (Crucianella) contain a red dye once…